98 PLEIOCENE FO.SSILS, 



Like M. similis, this species is found recent on the Southern coast. Numerous 

 specimens can at almost all times be collected from the sea beaches. 



Plate XXIII. Fig. 9, Interior and exterior of fossil, natural size. 



Locality. Pee Dee; Waccamaw; Smith's, Goose Creek. 



Museum, College of Charleston. 



MACTEA CONGEST A. — Con. 

 Plate XXIII. Fig. 10. 



Mactra congesta, Con., Foss. Ter. For., p. 27, pi. 15, fig. 2. 

 Mactra congesta, Con., Silliman's Amer. Jour., Vol. 23, p. 340. 



M. testa triangulari, ventricosa, inequilaterali; rostris prominentibus, umbonibus rnagnis; 

 margine buccali rotundata; margine anali coarctata, acuta. 



Description. Shell triangular, ventricose, inequilateral; beaks prominent; umbones 

 large; buccal margin rounded; anal margin narrowed, pointed. 



This species greatly resembles M. lateralis, Say; but is thicker, more inflated, and 

 attains a greater size, commonly twice as large. It is a common species in the Meiocene 

 of Virginia. 



Plate XXIII. Fig. 10, Both valves, natural size. 



Locality. Pee Dee; Smith's, Goose Greek. 



Museum, College of Charleston. 



